Remove feature gating in project insights index (#54650)

Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>

Author: evi-liu

content/issues/planning-and-tracking-with-projects/viewing-insights-from-your-project/index.md

@@ -7,7 +7,6 @@ versions:
 topics:
   - Issues
   - Projects
-product: '{% data reusables.gated-features.historical-insights-for-projects %}'
 children:
   - /about-insights-for-projects
   - /creating-charts